What does code P0415 mean?

Q: What does code P0415 mean?

Secondary Air Injection System Switching Valve 'B' Circuit. P0415 indicates that the powertrain control module (PCM) has detected an electrical fault in the control circuit for the secondary air injection (AIR) system's switching valve 'B'. The PCM monitors the valve's control wire for expected voltage changes when commanding the valve on and off, and it sets this code when the circuit does not respond as designed, which can prevent the AIR system from reducing cold-start emissions.

DTC codes / P04xx · Auxiliary emission controls / P0415

P0415Secondary Air Injection System Switching Valve 'B' Circuit

P0415 indicates that the powertrain control module (PCM) has detected an electrical fault in the control circuit for the secondary air injection (AIR) system's switching valve 'B'. The PCM monitors the valve's control wire for expected voltage changes when commanding the valve on and off, and it sets this code when the circuit does not respond as designed, which can prevent the AIR system from reducing cold-start emissions.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.